Campbell CR800 Specifikace stáhnout pdf (Strana 116)

Section 5. Program Declarations

5-6

Sub, Exit Sub, End Sub

Declares the name, variables, and code that form a Subroutine.

Syntax

Sub SubName [(VariableList )]

[ statementblock ]

[ Exit Sub ]

[ statementblock ]

End Sub

The Sub statement has these parts:

Part Description

Sub Marks the beginning of a Subroutine.

SubName Name of the Subroutine. Subname cannot be the same as

any other globally recognized name in the program.

VariableList List of variables that are passed to the Subroutine when it

is called. The list of Subroutine variables to pass is

optional. Subroutines can operate on the global program

variables declared by the Public or Dim statements. The

advantage of passing variables is that the subroutine can

be used to operate on whatever program variable is passed

(see example).

If the Subroutine variable list is used, the variable names

used in this list should not be the same names as variables,

aliases, or constants declared elsewhere. Multiple

variables are separated by commas. When the Subroutine

is called, the call statement must list the program variables

or values to pass into the subroutine variable. The number

and sequence of the program variables/values in the call

statement must match the number and sequence of the

variable list in the sub declaration. Changing the value of

one of the variables in this list inside the Subroutine

changes the value of the variable passed into it in the

calling procedure.

The call may pass constants or expressions that evaluate to

constants (i.e., do not contain a variable) into some of the

variables. If a constant is passed, the “variable” it is

passed to becomes a constant and cannot be changed by

the subroutine. If constants will be passed, the subroutine

should be written to not try to change the value of the

“variables” they will be passed into.

statementblock Any group of statements that are executed within the body

of the Subroutine.

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